Drake, in his "World Encompassed," speaking of some of the southern tribes of South America, probably the Patagonians, says that "their hatchetts and knives are made of mussel-shells, being great and a foot in length, the brickle part whereof being broken off, they grind them by great labor to a fine edge and very sharpe, and as it seemeth, very durable.[35] * * * Their working tools, which they use in cutting these things and such other, are knives made of most huge and monstrous mussell shells (the like whereof have not been seen or heard of lightly by any travelers, the meate thereof being very savourie and good in eating), which, after they have broken off the thinne and brittle substance of the edge, they rub and grind them upon stones had for the purpose, till they have tempered and set such an edge upon them, that no wood is so hard but they will cut it at pleasure with the same."[36] According to Sproat, shell knives were used by the Indians of Vancouver's Island in carving the curious wooden images placed over graves.[37] Ancient shell knives are very rarely found in collections. Such specimens as have come to my notice could as well be classed as scrapers or celts. We will probably not be far wrong in concluding that such implements were used for scraping and digging as well as for cutting. As a rule, knives proper were simply sharpened bivalve shells. The scrapers so frequently mentioned were doubtless often the same, but probably more frequently portions of the lower whorl of the large univalves. CELTS. Implements of this class are generally made from the lower part of large univalves. They were probably used in a variety of ways, with handles and without. The spine-like base of the shell forms the shaft, the blade being cut from the broadly expanded wall of the lower whorl. Nearly all the specimens in the national collection have been obtained in this way. In Plate XXV three very fine examples are figured. The specimen illustrated in Fig. 1 is more than usually well fashioned, and is extremely massive, having the proportions and almost the weight of typical stone celts. It is five inches in length, two and three-fourths in width, and nearly one inch through at the thickest part.